Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
nang hoa » nang hoat, hang hoa, nang hoc
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, le thanh
su triet » su viet, su tien, ve triet
co sach » bo sach, cuon sach, hoc sach
van bac » van ban, van bao, van hac
va tinh » may tinh
lam su » lai su, lam so, lam vu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu khach) or (co sach)) ky nang hoa hoc. hieu van bac duc ((va thanh) OR (va tinh)) lam su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu khach) OR (co sach)) ky nang hoa hoc. hieu van bac duc ((va thanh) OR (va tinh)) lam su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu khach) or (co sach)) ky nang hoa hoc. hieu van bac duc ((va thanh) OR (va tinh)) lam su triet".
• Adding a wildcard symbol may retrieve word variants: ((vu khach) or (co sach)) ky nang hoa hoc. hieu van bac duc ((va thanh) OR (va tinh)) lam su triet*.